410.1f - 909-Coding | 909Rtdc

The group 9S_pS_ps_ps_p is used to give supplementary information on _____. Although the codes provide for such reporting, unless special instructions are received from the ADM, only two 9-groups shall be used: ____.

special phenomena, 909R_td_c and 931ss

The 909R_td_c shall be used to indicate the ______ and ______

time at which precipitation began or ended, duration and character of precipitation

The 909R_td_c shall be reported whenever group _____ is encoded and the _____ of this group is not encoded as 000

6RRRt_R, 000

The 931ss group shall be used to indicate ______ and:

• The measurement is reported in ____, up to 55 cm

• Measurements above 55 cm shall be encoded in accordance with Table 15-31

• The group shall be included at the discretion of the RDG, but only by stations that take 4 staffed synoptic observations daily and when the rounded measurement is 1 or more

• depth of new fallen snow

• whole centimetres

What figure indicates that the group 9S_pS_ps_ps_p included in the report?

9

When selecting the R_t code and there is a choice, use _____.

the smaller code figure

When there are 2 or more time periods of precipitation, always use the _____.

last period

When you have coded ww = 50-98, use the time ____.

at which precipitation began

When you have coded ww = 20-27 and 20, this implies precipitation was in the last hour; therefore use the time ____.

when the last period began

For all ww codes other than 20-27, 29, and 50-98, use the time ____.

that the precipitation ended

The symbol R_t indicates the time at which precipitation given by _____ began or ended. It shall be coded with reference to _____.

RRR, the official time of observation

Code the following R_t

Precipitation Type: -RA

Start: 0817

Stop:

9094

Code the following R_t:

Precipitation Type: -RA

Start: 0817

Stop: 1133

9094

Code the following R_t:

Precipitation Type: -RA

Start: 0817

Stop: 1028

9092

Code the following R_t:

Precipitation Type: -SHRA

Start: 0612

Stop: 0639

Precipitation Type: -SHRA

Start: 0816

Stop: 0845

9092

Code the following R_t:

Precipitation Type: -SHRA

Start: 0542

Stop: 0639

Precipitation Type: -SHRA

Start: 1016

Stop:

9092

Code the following R_t:

Precipitation Type: -SN

Start: 0628

Stop: 1139

Precipitation Type: DRSN

Start: 0812

Stop:

9091

The symbol d_c indicates the ____ of precipitation given by RRR.

Occurrences of precipitation shall be considered as separate periods of precipitation when separated by intervals of _____.

duration and character, 15 minutes or more

If only one period of precipitation has occurred during the past 6 hours, which d_c codes apply?

0-3

If two or more periods of precipitation have occurred during the past 6 hours, which d_c codes apply?

4-7

Code the following R_td_c

Precipitation Type: -RA

Start: 0817

Stop:

90942

Code the following R_td_c:

Precipitation Type: -RA

Start: 0817

Stop: 1133

90942

Code the following R_td_c:

Precipitation Type: -RA

Start: 0817

Stop: 1028

90920

Code the following R_td_c:

Light rain began at 0211Z on the previous day

Precipitation Type: -RA

Start: →

Stop: 0639

Precipitation Type: -RA

Start: 1016

90927

Code the following R_td_c:

Precipitation Type: -SN

Start: 0628

Stop: 1139

Precipitation Type: DRSN

Start: 0812

Stop:

90912